Seat Licenses And Other Intangible Assets (Components Of Other Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Gross Value	$ 7,895	$ 7,895
Accumulated Amortization	(3,087)	(2,875)
Net Value	4,808	5,020
Seat Licenses [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Lives	5 years	5 years
Gross Value	3,047	2,936
Accumulated Amortization	(1,537)	(1,393)
Net Value	1,510	1,543
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Lives	8 years	8 years
Gross Value	5,400	5,400
Accumulated Amortization	(2,475)	(2,306)
Net Value	2,925	3,094
Trade Name [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Lives	15 years	15 years
Gross Value	2,400	2,400
Accumulated Amortization	(586)	(547)
Net Value	1,814	1,853
Website [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Lives	12 years	12 years
Gross Value	95	95
Accumulated Amortization	(26)	(22)
Net Value	$ 69	$ 73